Reference no: EM133001002

ITECH2300 Mobile Network & Wireless Communication

Assignment Questions

Part -A

Q1. In relation to access to wireless network (e.g, WiFi), answer the following questions:

a. What is media access control and why is it important?
b. Give one example each of the controlled access methods and contention based media access methods?
c. When might one access method be preferred over another in a network, and why?
d. Under what conditions do contention-based media access control techniques outperform controlled-access techniques (i.e., have lower response time)? Explain.

Q2. Four users (U1, U2, U3 and U4) are using CDMA access techniques to transmit data to their respective receivers (U1->R1, U2->R2, U3->R3 and U4->R4). The followings are the spreading codes and the data that each user wants to send.

Users	Spreading code	Data to send
U1	1 1 1 1	0 0 0
U2	0 0 1 1	1 0 0
U3	1 0 0 1	0 0 1
U4	1 0 1 0	1 1 1

Using a spreadsheet similar to the one shown in Week 7 tutorial,
(a) show the composite signal that each receiver will receive;
(b) show how each receiver can retrieve its own data using the corresponding spreading code.

Note: encode ‘1' in data as ‘+1' and ‘0' in data as ‘-1' for this work.

Q3. Write a short essay on 5G technology in Australia. Your essay should include the followings:
• discuss the coverage of 5G technology by the leading telcos in Australia and plan for future coverage,
• can 5G technology help Australian businesses and services to increase efficiency and productivity?
• discuss Australian government's initiative for innovation around 5G technology,

• do you think 5G is a competitor to NBN for Australian businesses' and domestic users' connectivity needs? Justify your answer.

Your essay should be of minimum 300 words and include references for your discussion wherever appropriate.

Part B - Scanning Wireless Access Points [Total 20 marks] Q4. The software inSSIDer from metageek lets you scan surrounding WiFi networks.

a. Investigate wireless networks available in a shopping centre. Use the inSSIDer package installed on your laptop and walk through a shopping centre. Record the wireless networks available in at least three spots (you may consider going close to a retails or restaurant that provides free WiFi, such as McDonnalds). Capture the inSSIDer screenshots.

Give the list of available networks/access points including their technical characteristics like channel number, signal (SNR, signal to noise ratio in dB), security, etc. Include your screenshots from the software. Make some observations based on the data you collected, like, how do you relate SNR with the distance (from your own location to access points), overcrowded channels (i.e., multiple networks are transmitting using the same set of channels), etc.

b. Use inSSIDer at you home (or place of residence where you have other WiFi networks) and observe the signal strength and channel number of your own network and other networks. Can you suggest any way to change your access point's (i.e., home router's) transmission setting to get better reception within your home?

Attachment:- Wireless Communication.rar